Remove string copy

Changed 'ecma_copy_or_ref_ecma_string' to 'ecma_ref_ecma_string'. It does
not copy the string if the maximum number of reference counter is reached,
but bails out with an error like the 'ecma_ref_object' function does.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

jerry-core/ecma/base/ecma-gc.c

@@ -167,7 +167,7 @@ ecma_init_gc_info (ecma_object_t *object_p) /**< object */
 void
 ecma_ref_object (ecma_object_t *object_p) /**< object */
 {
-  if (object_p->type_flags_refs < ECMA_OBJECT_MAX_REF)
+  if (likely (object_p->type_flags_refs < ECMA_OBJECT_MAX_REF))
   {
     object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs + ECMA_OBJECT_REF_ONE);
   }